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85 lines
3 KiB
OpenEdge ABL
85 lines
3 KiB
OpenEdge ABL
[InsertInstruction::] The Insert Construct.
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Defining the insert construct.
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@h Definition.
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For what this does and why it is used, see //inter: Data Packages in Textual Inter//.
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But please use it as little as possible: in an ideal world it would be abolished.
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=
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void InsertInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(INSERT_IST, I"insert");
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InterInstruction::specify_syntax(IC, I"insert TEXT");
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InterInstruction::fix_instruction_length_between(IC, 3, 3);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, InsertInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, InsertInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, InsertInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, InsertInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of an |insert| instruction is laid out with the two
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compulsory words |ID_IFLD| and |LEVEL_IFLD|, followed by:
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@d TEXT_INSERT_IFLD 2
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=
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inter_error_message *InsertInstruction::new(inter_bookmark *IBM,
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text_stream *text, inter_ti level, struct inter_error_location *eloc) {
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inter_warehouse *warehouse = InterBookmark::warehouse(IBM);
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inter_package *pack = InterBookmark::package(IBM);
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inter_ti ID = InterWarehouse::create_text(warehouse, pack);
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Str::copy(InterWarehouse::get_text(warehouse, ID), text);
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inter_tree_node *P = Inode::new_with_1_data_field(IBM, INSERT_IST,
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/* TEXT_INSERT_IFLD: */ ID,
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eloc, level);
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inter_error_message *E = VerifyingInter::instruction(pack, P); if (E) return E;
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NodePlacement::move_to_moving_bookmark(P, IBM);
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return NULL;
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}
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void InsertInstruction::transpose(inter_construct *IC, inter_tree_node *P, inter_ti *grid,
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inter_ti grid_extent, inter_error_message **E) {
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P->W.instruction[TEXT_INSERT_IFLD] = grid[P->W.instruction[TEXT_INSERT_IFLD]];
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}
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@ Verification consists only of sanity checks.
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=
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void InsertInstruction::verify(inter_construct *IC, inter_tree_node *P,
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inter_package *owner, inter_error_message **E) {
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*E = VerifyingInter::text_field(owner, P, TEXT_INSERT_IFLD);
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}
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@h Creating from textual Inter syntax.
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=
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void InsertInstruction::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
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inter_error_location *eloc, inter_error_message **E) {
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TEMPORARY_TEXT(raw)
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*E = TextualInter::parse_literal_text(raw, ilp->mr.exp[0], 0, Str::len(ilp->mr.exp[0]), eloc);
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if (*E == NULL)
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*E = InsertInstruction::new(IBM, raw, (inter_ti) ilp->indent_level, eloc);
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DISCARD_TEXT(raw)
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}
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@h Writing to textual Inter syntax.
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=
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void InsertInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P,
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inter_error_message **E) {
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text_stream *insertion = InsertInstruction::insertion(P);
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WRITE("insert ");
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TextualInter::write_text(OUT, insertion);
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}
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@h Access function.
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=
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text_stream *InsertInstruction::insertion(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (P->W.instruction[ID_IFLD] != INSERT_IST) return NULL;
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return Inode::ID_to_text(P, P->W.instruction[TEXT_INSERT_IFLD]);
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}
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